The finish Elevation of the crown of a 28 foot wide road at the centerline is 76.5 feet with a 2% slope to the edges. It has an 8 inch subbase, 6 inch base, and a 4 inch surface coat. What is the finish elevation at the edge prior to laying the subbase?

The finish Elevation of the crown of a 28 foot wide road at the centerline is 76.5 feet with a 2% slope to the edges. It has an 8 inch subbase, 6 inch base, and a 4 inch surface coat. What is the finish elevation at the edge prior to laying the subbase?